The effects of a transition between local and global processing on vigilance performance

Area of Science:

• Cognitive Neuroscience
• Neuroscience
• Psychology

Background:

• Sustained attention is crucial for many cognitive functions.
• Understanding how the brain adapts to changing attentional demands is important.
• Feature discrimination tasks, focusing on global or local elements, probe attentional control.

Purpose of the Study:

• To investigate the impact of attentional task transitions on performance.
• To examine the neural correlates of sustained attention using functional near-infrared spectroscopy (fNIRS).
• To compare brain activity during continuous versus transitioning attention tasks.

Main Methods:

• Sixty participants completed sustained attention tasks involving global or local feature discrimination.
• Participants were assigned to groups with either continuous or transitioning task demands.
• Cerebral hemodynamic activity was measured using fNIRS to assess blood oxygenation.

Main Results:

• Performance declined significantly following a transition between attention tasks compared to continuous tasks.
• The group performing local discrimination showed performance improvements over time, unlike the global discrimination group.
• Global discrimination tasks showed greater increases in total brain oxygenation.
• The left prefrontal cortex exhibited distinct activity patterns between transition and non-transition tasks.

Conclusions:

• Attentional task transitions negatively impact performance.
• Sustained engagement with local feature discrimination may lead to performance gains.
• Increased utilization of bilateral brain resources, particularly in the prefrontal cortex, may enhance performance during demanding attentional tasks.